Ball point pen



FIG. 1 is a front elevational view of a ball point pen showing my new design with the writing point in the extended writing position;

FIG. 2 is a front elevational view thereof with the writing point in the retracted position;

FIG. 3 is a right side elevational view of FIG. 1, the left side elevational view being the mirror image thereof;

FIG. 4 is a rear elevational view of FIG. 1;

FIG. 5 is a top plan view thereof; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a ball point pen, substantially as shown and described. 